We chose a private school for the rigor and type of education that our son could not receive locally, not for any particular college result. We did not want him to attend any of the AP mills around us as we wanted to avoid teach-to-a-test curriculums. We were way more concerned about the quality of our son’s secondary education than college because we believe that if the high school education is stellar, college will take care of itself.
This question has been discussed recently on the Let’s Talk GPA thread where I gave an example of how colleges evaluate GPAs from disparate high schools.